DCF77

E

Enzo

Guest
Is there someone that is using radio clock circuits ?
I have an AM receiver end an antenna that should receive the Franckfurt
radio sugnal, but i do not receive anything, even moving the antenna in
every direction, with an oscilloscope waiting in vain for a signal.
If I have well understood, there should be a signal (1 or 0)every second.
(Italy, Genova)

Enzo
 
"Enzo" <ternavasio@enzoternavasio.it> wrote in message
news:vvgyd.555207$35.23453888@news4.tin.it...
Is there someone that is using radio clock circuits ?
I have an AM receiver end an antenna that should receive the Franckfurt
radio sugnal, but i do not receive anything, even moving the antenna in
every direction, with an oscilloscope waiting in vain for a signal.
If I have well understood, there should be a signal (1 or 0)every second.
Click to expand...
I'd test the receiver with a 77.5 kHz signal from a signal generator. If you
haven't got one, you could build a suitable oscillator.

Leon
 
Do you mean I must transmit 77.5Khz with a transmitter ?
Anyway, the receiver should be ok; it is a standard circuit sold fro this
puprose.

Enzo
 
"Enzo" <ternavasio@enzoternavasio.it> wrote in message
news:uamyd.556872$35.23542962@news4.tin.it...
Do you mean I must transmit 77.5Khz with a transmitter ?
Click to expand...
No, I said a signal generator or a suitable oscillator. Something to provide
a stable low-power 77.5 kHz signal.

Anyway, the receiver should be ok; it is a standard circuit sold fro this
puprose.
Click to expand...
It's much easier to test this type of thing if you can generate the input
signal locally. You obviously have some sort of problem with it.

Leon
 
In article <vvgyd.555207$35.23453888@news4.tin.it>, "Enzo" <ternavasio@enzoternavasio.it> wrote:
Is there someone that is using radio clock circuits ?
I have an AM receiver end an antenna that should receive the Franckfurt
radio sugnal, but i do not receive anything, even moving the antenna in
every direction, with an oscilloscope waiting in vain for a signal.
If I have well understood, there should be a signal (1 or 0)every second.
(Italy, Genova)
Click to expand...
Hi Enzo,
For bella Italia you may also consider Swiss Timing.
see www.metas.ch/en/labors/official-time/hbg/index.html

The transmitter sends to DCF77 compatible code at 75kHz.
 
I do not have experience in radio circuits, so i have an antenna for 77.5
KHz, (and a Am receiver) what should i do for receiveing signals from
Switzerland ?
 
But my problem is that I do not have any signal at the output of the AM
receiver.
The circuit is a standard circuit that should work.
It is composed af an antenna for 77.5KHz and an integrated receiver, with
0/5v output.
May be my geografical position is not good for that signal.

Enzo
 
"Enzo" <ternavasio@enzoternavasio.it> wrote in message
news:sExyd.325191$b5.15747310@news3.tin.it...
I do not have experience in radio circuits, so i have an antenna for 77.5
KHz, (and a Am receiver) what should i do for receiveing signals from
Switzerland ?

The DCF77 receivers often have a crystal filter for selectivity, so retuning
Click to expand...
will be impossible in that case. The crystal has the same shape as a watch
crystal, a cylinder of 2mm diameter and about 10 mm long.

Wim
 
In article <vvgyd.555207$35.23453888@news4.tin.it>,
Enzo <ternavasio@enzoternavasio.it> wrote:
Is there someone that is using radio clock circuits ?
I have an AM receiver end an antenna that should receive the Franckfurt
radio sugnal, but i do not receive anything, even moving the antenna in
every direction, with an oscilloscope waiting in vain for a signal.
If I have well understood, there should be a signal (1 or 0)every second.
(Italy, Genova)
Click to expand...
To actually hear it, you 'll have to listen to it as if it were
a morse code or USB signal. It's a very narrowband signal where
they modulate the phase and amplitude of this signal at a very slow
rate. Even then it' will just be a tone that jumps in signal strength
once a second. (Well, at least that's what WWVB in the US sounds like).

Mark Zenier mzenier@eskimo.com Washington State resident
 
Enzo wrote:
Do you mean I must transmit 77.5Khz with a transmitter ?
Anyway, the receiver should be ok; it is a standard circuit sold fro this
puprose.

Enzo


If it is the IC I think it is - it has an open collector
Click to expand...
output. You do use a pull-up resistor, don't you?

Regards,

Iwo
 
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